Forum Schedule Fall 2022

In the coming years, several different experiments are poised to make measurements relevant to understanding Cosmic Dawn and the Epoch of Reionization. They Hydrogen Epoch of Reionization Array (HERA) is currently making measurements of the 21cm signal. The Simons Observatory will soon being observing the cosmic microwave background, including the kinetic Sunyaev-Zel’dovich (kSZ) effect. The James Webb Space Telescope, currently in flight, and the Nancy Grace Roman Space Telescope, scheduled to fly later this decade, will provide exquisite surveys of high-redshift galaxies. Taken together, these observatories will provide us with key insight on astrophysics and cosmology from the high-redshift universe, such as the global ionization fraction and the optical depth to the CMB tau. In this talk, I provide updates on measurements made by HERA, as well as explore how these measurements can be combined in cross-correlation to infer some of these parameters. I look in detail at the kSZ^2–galaxy cross-correlation, as well as the 21cm–galaxy cross-correlation. I show that these statistics are likely detectable with data from upcoming experiments, though there are still several observational challenges that must be overcome when combining these measurements in practice.